Strip punching and winding machine



Feb. 6, 1962 H. JAUN 3,019,998

STRIP PUNCHING AND WINDING MACHINE Filed Dec. 1, 1959 2 Sheets-Sheet 1-//vv/v70 B HERMAN/V .44 UN i M ys.

Feb. 6, 1962 H. JAUN STRIP PUNCHING AND WINDING MACHINE 2 Sheets-Sheet 2Filed Dec. 1, 1959 United States Patent 3,019,998 STRIP PUNCHING ANDWlNDING MACHINE Hermann Jaun, Regensdorf, Switzerland, assignor toElehtro-Motoren A.G., Zug, Switzerland Filed Dec. 1, 1959, Ser. No.856,602 Claims priority, application Austria Dec. 15, 1%?! 4 Claims.(Cl. MIL-56.8)

I Especially for the manufacture of electric disk-armature motors, it isknown to wind a strip, which is provided with recesses punched atdistances apart, to a coil, on which the punched recesses form radiallyor spirally extending grooves. Into these grooves the electric windingsof the motor can be laid.

Since the perimeter of the strip coil increases with every turn, therecesses in the strip must be punched at gradually increasing distancesapart.

For solving this problem, it is known to produce grooved strip coils insuch a way that a winding mandrel for the strip is each time, betweentwo consecutive punchings, rotated thru a predetermined angle, thespaced relation between the punching place and the rotary axis of thewinding mandrel being increased with growing diameter of the coil, andthe strip kept in contact with a rectilinear guide which is tangentialto the coil and touches an imaginary plane substantially intersectingthe punching p a In machines of the type known heretofore, the punchingunit is movable relative to the winding mandrel, the latter beingstationarily disposed at least in the horizontal. This design, however,suffers from serious disadvantages, inasmuch as the punching unit iscomparatively heavy and subjected to steadily changing forces which, inthe long run, areliable to flatten the guides, thus deteriorating themand even rendering them unserviceable, unless particularly stout andhence expensive constructions are provided. it should be borne in mindthat, depending on the thickness of the sheet and the size of thegrooves, the punching pressure may range, say, from two to five tons.

The invention also relates to an arrangement for producing strip coilsof the type, differing, however, from the prior art essentially by thefact that the punching place is stationarily located, and the windingmandrel rotatably supported on a slide guided along a rectilinear track,so that the rotary axis of the mandrel moves in a plane whichsubstantially intersects the punching place and is inclined with respectto the surface of the guide rail, and that said slide is under theinfluence of a weight or of a spring tension adapted to draw the slidetowards the punching place, keeping thereby the strip coil being formedin engagement with the guide rail.

The punching place being stationary, a usual punching unit may be used,having any desired precision and working speed. Hence, nocorrespondingly more expensive special constructions of the punchingunit will be needed. The continually changing mechanical forcesoccurring when punching, are directly absorbed by the frame of thepunching unit and need not be transmitted through guides for displacingthe punching unit. Since the latter is in every case many times heavierthan the winding mandrel and the strip coil being formed, it is thuspreferable to have the punching unit arranged stationary and the mandreldisplaceable. The means for rotating the winding mandrel may be ofsmaller dimensions than those for driving the punching unit; also forthis reason it is preferable to have the Winding mandrel arrangeddisplaceable, and the punching unit stationary. Therefore, through thearrangement according to the invention much more favorable kinematicconditions will result throughout than with the machines knownheretofore. Hence a higher working speed is also possible.

According to another advantageous feature of the present invention, theguide rail, engaged by the strip coil, is adjust-ably arranged andinclined on the machine frame. Thus it becomes possible selectively toproduce radially extending grooves or grooves running obliquely to theradial direction.

Further features of the invention will appear from the followingdescription and claims, taken in conjunction with the accompanyingdrawing, with reference to which;

the invention is disclosed hereinafter example, and wherein:

FIG. 1 shows a front view of the most important parts of a form ofembodiment of the arrangement in accordance with the invention;

purely by way of PEG. 2 represents a sectional view on the line II-I'lof PEG. 7 illustrates in a similar way the formation of a strip coilwith obliquely extending grooves. The arrangement as shown in thedrawing includes a punching machine as a main component, whose design isa known per se and need only be disclosed here quite rough- 1y.According to KG. 1, the machine comprises an underframe 10 with acarrier table 11. Mounted on the latter are upstanding tubular guides12, each accommodating a vertically displaceable bar 13. The lower endsof the bars 13 are interconnected by a yoke 14 fixed thereto by means ofnuts 15. A bearing portion of the yoke 14 has a connecting rod 17 whichis rockably mounted thereon by means of a horizontal axle 16 and alsoarranged ona crankpin 18. The crankpin 13 is eccentrically connected toa shaft (not visible in the drawing) which, by means of bearing pieces19, is rotatably located beneath the table ii and associated with adriving motor (not shown). Said shaft further carries a sprocket wheel20 which is referred to later on.

The upper ends of the bars 13 are connected to each other by a yoke 22fixed thereto by means of nuts 23. A threaded bore in the yoke 22 isengaged by a vertically running and axially displaceable screw-bolt 2-4.This screw-bolt carries at its lower end a holding device 25 for anexchangeable punching tool 26. A matrix as-' sociated with the tool 26is exchangeably mounted on a holder 28 being in turn located on a block29 supported and fixed on the table 11.

Disposed on the table 11 is a winding device which forms another maincomponent part of thearrangement and is described hereafter. Asubstantially frame-like supporting member 31 is mounted on the table 11by means of a bracket-like foot 32. Said member 31 comprises twoparallel guide rails 33 (FIGS..2 and 3) be tween which, by means ofrollers 35, a slide 34 is displaceably guided along a rectilinear trackinclined at an angle to the horizontal.

Rotatably mounted on slide 34 is a shaft 36 whose axis extendshorizontally and at right angles to the direction of movement of theslide. The front end of the shaft 36 carries a removable andexchangeable winding mandrel 37 which is firmly connected thereto bymeans of a screw 38. Mounted on the other end portion of the shaft 36 isa ratchet wheel 39 engaged by a pawl 40 under its force of gravity or byreason of the power of a spring (not shown), FIGURES 2, 3 and 4. Thepawl 40 is fulcrumed on a bolt 41 at the end of a lever 42 looselyarranged on shaft 36 and hence swingable with respect to the latter. Anut 43 screwed onto the rear Patented Feb. 6, 1962 portion of a stripprovided end of said shaft and a disk 44 prevent the lever 42 fromsliding off the shaft 36, without the lever 42 having to be clamped.Moreover, by means of a bolt 45 (FIG. 4) the slide 34 has rockablymounted thereon a pawl 46 which, as biassed by a torsion spring (notshown), engages the ratchet wheel 39 to secure the same from turningcontrary to the arrow R.

Through the joint pin 48, the lever 42 is pivoted to one end of aconnecting rod 47, the other end of which engages a crankpin seated on asliding or clamping piece 49 (FIG. 3). The latter engages a groove 51with undercut flanks diametrically arranged on a wheel-disk 50, and isadjustable in the longitudinal direction of said groove for the purposeof altering the crank arm (FIG. 4). However, by means of a screw 52,said piece 49 can be secured in any set position, without theconnectingrod 47 being thereby clamped on the crankpin. The wheel-disk50 is seated fast on a shaft 53 which runs parallel to shaft 36 and isrotatably carried in slide 34, as shown in FIGS. 1 and 3.

A bevel-gear 55, integral with wheel-disk 50, meshes another bevel-gear56 which, according to FIG. 3, rides on one end of a shaft 57 whichextends parallel to the direction of movement of the slide 34 and isalso rotatably supported thereon. Said shaft 57 possesses an extension58 of non-circular cross-section. The extension 58 has for this purposetwo longitudinal grooves 58a which are engaged by two so-called drivingkeys 59. Said extension can be moved axially across a sleeve 60 havingsaid keys arranged thereon. The sleeve 60 can be turned, but is securedfrom axial displacement on the carrier member 31 and forms the hub of abevel-gear 61. The latter meshes another bevel-gear 62 which is seatedon a shaft 63 rotatably supported on the carrier 31, said shaft furthercarrying a sprocket wheel 64 as can be recognized from FIGS. 1 and 2.Through an open-link chain 65, the sprocket wheel 64 is coupled to theaforementioned sprocket wheel of the punching machine.

The slide 34 has anchored thereto one end of a flexible draw-member 68which, for instance, is a wire-rope. The draw-member 68 runs over aguide roller 69 rotatably mounted on the machine frame and is at itsother end loaded with a weight (not shown) which tends to move the slide34 upwards and towards the punching tool 26.

Attached to the table 11 is a holding angle-iron 70 (FIGS. 1 and 2),having a guide rail 71 adjustably and fixably located thereon. Theangle-iron 70 has to this effect an arcuately extending groove 72 whichis engaged by a suitably curved spur 73 of the guide rail 71. The centerof curvature of the groove 72 and of the spur 73 are substantially atthe punching place of the punching machine, that is to say where thelongitudinal median axis of the tool 26 intersects the upper bearingface of the matrix 27. A screw 74 permits of clamping the spur 73 in theset position on the angle-iron 70. At top the guide rail 71 has arectilinear flat guide surface 75 on which the winding mandrel 37 or thecoil being formed thereon can rest.

As the slide 34 is displaced along its track, the axis of the mandrel 37moves in a plane 80 (FIGS. 6 and 7) which substantially intersects thelongitudinal axis 81 of the tool 26 at the punching place. The guidesurface 75 touches an imaginary plane 82 which also intersectssubstantially the longitudinal axis 81 of the tool 26 at the punchingplace and is inclined relative to the plane 80 at an angle 83 (FIG. 6)or 84 (FIG. 7).

With the arrangement described hereinbefore, strip coils with groovescan be made as follows:

A strip 85 consisting, say, of sheet-iron, is drawn from a stock roll(not shown), passed through between the tool 26 and matrix 27 of thepunching machine and stuck with its first end into a slit 37a of themandrel 37 for anchoring it (FIG, 1). Under the influence of the weightacting upon the draw-member 68, the mandrel 37 lies not far from thetool 26 at the guide surface of the guide rail 71. When the punchingmachine is set in operation, the crank 18 will cause the frame formed ofthe bars 13 and yokes 14, 22 to move vertically up and down by means ofthe connecting rod 17, the tool 26 following this movement. At eachdownward movement of the tool 26, it penetrates the strip 85 and punchesa recess or aperture in it (FIG. 5).

Through chain 65, the sprocket wheel 20 drives the sprocket wheel 64which in turn causes the shaft 57 journaled in slide 34 to rotatethrough the intermediary of the pair of bevel-gears 61, 62. This pair ofbevel-gears 61, 62 drives the wheel-disk 50 which imparts to lever 42 areciprocatory rocking movement by means of the connecting rod 47. In therocking movement in one sense, the pawl 40 loosely slides over the teethof the ratchet wheel 39 whereas in the rocking movement in the othersense the pawl 40 firmly engages the teeth of the ratchet wheel 39, thusdisplacing the latter angularly to a certain extent in the sense of thearrow R in FIG. 4. The number of revolutions of the wheel disk 50corresponds to that of the crankpin 18 of the punching machine, and themovement of the lever 42 carrying the pawl 40 is synchronized with themovement of the tool 26, so that rotation of the ratchet wheel 39 andhence of the winding mandrel 37 takes place whenever the tool 26 is overthe matrix 27 and strip 85. Rotation of the mandrel 37 each time causesa portion of the strip 85 to be wound thereon, so that the tool 26, inits next downward movement, makes a recess which is displaced a certainamount from the preceding one in the longitudinal direction of the strip85.

If it is required that the recesses made in the strip coil 85 beingproduced should form, say, eight radially extending grooves 88 (FIG. 6),the sliding and clamping shoe 49 in the groove 51 of the wheel-disk 50has to be set in such a way that each time, between two successivepunchings, the mandrel 37 is rotated through a constant angle of 45degrees or, in general terms, through an angle of where n=the number ofgrooves to be made in the strip coil. The winding mandrel andsubsequently the strip coil under formation lie against the guide face75 and perform a generating movement thereon upon rotation of themandrel. With increasing diameter of the coil 87, it travels along theplane always farther away from the punching place. Because of the guideface 75 being inclined at an angle 83 relative to the plane 80, alongwhich the axis of the mandrel 37 can move, for every momentary diameterof the coil 87 quite a definite position of the mandrel will result. Inthe described manner, the axis of the mandrel 37 is guided so that theangle 89 between the plane 89 and the strip portion running tangentiallyonto the coil 87 being formed, remains invariably the same and has thesame size as the angle 83.

The place, on which the strip 85 runs onto the coil 87 has then alwaysthe same angular position relative to the axis of the winding mandrel37. By properly selecting the angle of inclination 83, corresponding tothe thickness of the strip 85, it will be achieved that in all turns ofthe coil the recesses 86 will come to lie exactly over each other andthus form radially extending grooves 88.

For making strip coils with a different number of grooves, all that needbe done is to alter the setting of the sliding and clamping shoe 49 atthe wheel-disk 50, but not the inclination of the guide face 75 as longas the thickness of the strip to be wound remains the same.

If the guide rail 71 is set in another way so that its guide face 75with respect to the plane 80, along which the axis of the mandrel 37 ismovable, makes an angle of inclination 84 (FIG. 7), which is greater orsmaller with respect to the aforementioned angle 83, the recesses 86made on the coil 87a will form grooves 88a which extend obliquely orspirally in one or the other direction in relation to the radialdirection.

Also in this case, the angle 90 between the plane 80 and the stripportion running tangentially onto the coil being formed remains constantand of the same size as the angle 84, The angular position of the place,at which the strip 85 runs onto the coil 87a, also remains unchangedwith respect to the axis of the mandrel 37.

t has to be mentioned that in all cases described hereinbefore, theguide face 75, with respect to the strip portion running tangentially tothe mandrel 137 or to the coil 87 or 87a under formation, is inclined atan angle twice as great as the plane 80 along which the axis of themandrel 37 can be moved. Per se it is, however, also possible to arrangethe guide face 75 over the mandrel 37 so as to cause the strip portion85 running onto the coil under formation to run along the guide surface.Then, however, there is the inconvenience of continuous friction betweenthe strip and the guide surface.

The guide surface 75 need not necessarily be flat, but

could, for instance, also be curved cylindrically, provided the guidesurface extends rectilinear and touches the imaginary plane 82 whichintersects the axis of the tool 26 substantially at the punching place.

While the form of embodiment of the invention as herein disclosed,constitutes a preferred form, it is to be understood that some otherchanges may be made inthe arrangement, construction and combination ofthe various parts, and it is our intention to cover by our claims suchchanges as may reasonably be included within the scope thereof.

What I claim is:

1. A machine for producing strip coils with grooves formed by recessespunched into the strip being wound, comprising a stationary punchingdevice, operating means for said punching device, a slide, a rectilineartrack for guiding the slide, a coil winding device having a windingmandrel rotatably supported on the slide so that on moving the slidealong the track the rotary axis of said mandrel moves in a plane whichsubstantially intersects the punching place of said punching device, amechanism actuated by said operating means for rotating said manpunchingdevice, a rectilinear stationary guide rail having a guide surfaceextending in a second plane substantially intersecting the punchingplace at an acute angle with respect to the first-mentioned plane, andmeans for urging said slide along said track toward the punching placemaintaining thereby the strip coil under formation on said windingmandrel in tangential contact with said guide surface of the guide rail.7

2. A machine for producing strip coils with grooves formed by recessespunched into the strip being wound, according to claim 1, in which amachine frame is pro- ,vided, the guide rail being adjustable and fixedon the machine frame to permit altering the inclination of the guidesurface with respect to the track for guiding the slide.

3. A machine for producing strip coils with grooves formed by recessespunched into the strip being wound, according to claim 1, in which adriving shaft is provided which rotates continuously and which extendsparallel to the track on which the slide moves, the winding mandrelbeing operatively connected to the driving shaft which is in turnconnected to the operating means of the punching device in any positionof the slide.

4. A machine for producing strip coils with grooves formed by recessespunched into the strip being wound, according to claim 1, in which acontinuously rotating driving shaft is provided which extends parallelto the track for guiding the slide, the winding mandrel beingoperatively connected to the driving shaft which is in turn connected tosaid operating means of the punching device in any position of theslide, and in which a rotatable sleeve is provided, the driving shaftbeing displaced together with the slide and is provided with anextension of non-circular cross section which, in any position of thesaid slide engages the rotatable sleeve which permits axial displacementof the extension and forms the hub of a wheel connected to a shaft ofthe punching device.

References Cited in the file of this patent UNITED STATES PATENTS2,123,350 Anderson July 12, 1938

